<style>
   h1{ border: #454545 solid 10px;
       border-radius: 30px;

       padding: 20px;
       padding-left: 30px;
       padding-top: 40px;
       padding-right: 40px;

       margin:50px;
       margin-top: 30px;
   }
   </style>
<body>
    <h1>你好呀</h1>
    <h1 id="hi">你好呀</h1>
</body>